summation of a variable over a scalar

GAMS
1

Dear all

how is it possible to write summation of x to the power of i which i goes from 1 to c-1 in which c is a decision variable?
many thanks in advance,
Regards

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2

Try this:
sum(i$ ((ord(i) ge 1) and (ord(i) le card(c)-1)), x**i)

On Wed, Apr 15, 2015 at 9:07 AM, mahmood golabi wrote:

Dear all

how is it possible to write summation of x to the power of i which i goes from 1 to c-1 in which c is a decision variable?
many thanks in advance,
Regards

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3

Thanks dear Rubaiee


by using your idea with a little change I wrote the code and the result is true:

set i /1*1000/
sum(i$((ord(i) ge 1) and (ord (i) le ((c)-1))),power(x, ord (i)))

Thanks again for your nice idea

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